OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Prosthodont JT - The International Journal of Prosthodontics IS - 1942-4426 (Electronic) IS - 0893-2174 (Print) IP - 2 VI - 35 PST - ppublish DP - 2022 PG - 240-244 LA - en TI - Impact Strength of 3D-Printed and Conventional Heat-Cure and Cold-Cure Denture Base Acrylic Resins LID - 10.11607/ijp.7246 [doi] FAU - Lee, Jieun AU - Lee J FAU - Belles, Donald AU - Belles D FAU - Gonzalez, Maria AU - Gonzalez M FAU - Kiat-Amnuay, Sudarat AU - Kiat-Amnuay S FAU - Dugarte, Alba AU - Dugarte A FAU - Ontiveros, Joe AU - Ontiveros J CN - AB - Purpose: To evaluate and compare the impact strength of 3D-printed resin to conventionally fabricated denture bases of heat-cure and cold-cure acrylic resin. Materials and Methods: Denture base materials were evenly divided into three groups (n = 25 each; N = 75): (1) 3D-printed material (Denture Base LP, Formlabs Dental); (2) Heat-cure acrylic resin (Lucitone 199, Dentsply Sirona); and (3) cold-cure acrylic resin (Lucitone HIPA, Dentsply Sirona). The 3D-printed specimens were designed with the dimensions 64 × 12.7 × 3.2 mm using computer-aided design software, then printed with a desktop stereolithography printer (Form 2, Formlabs). Heat-cure and cold-cure acrylic resin specimens were fabricated through conventional (compression and pouring) methods. The impact energy was read directly from the impact tester in joules, and the cross-sectional area of each specimen was used to calculate the impact strength in kJ/m2. Analysis of variance, Tukey multiple comparisons test, and a likelihood ratio α = .05 were conducted. Results: The average mean impact strength was 8.9 kJ/m2 for heat-cure acrylic resin, 11.2 kJ/m2 for 3D-printed resin, and 14.9 kJ/m2 for cold-cure acrylic resin. Tukey multiple comparisons test showed that the impact strength for the cold-cure group was significantly greater than for the 3D-printed resin and heatcure acrylic resin groups. Conclusion: Within the limitations of this study, the cold-cure acrylic resin showed the greatest impact strength, followed by the 3D-printed resin and conventional heat-cure denture base materials, respectively. AID - 1218403